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hrupond.f
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subroutine hrupond
!! ~ ~ ~ PURPOSE ~ ~ ~
!! this subroutine routes water and sediment through ponds in the HRUs
!! ~ ~ ~ INCOMING VARIABLES ~ ~ ~
!! name |units |definition
!! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
!! bp1(:) |none |1st shape parameter for pond surface area
!! |equation
!! bp2(:) |none |2nd shape parameter for the pond surface area
!! |equation
!! hru_ha(:) |ha |area of HRU in hectares
!! ihru |none |HRU number
!! latno3(:) |kg N/ha |amount of NO3-N in lateral flow in HRU for
!! |the day
!! minpgw(:) |kg P/ha |soluble P loading to reach in groundwater
!! no3gw(:) |kg N/ha |nitrate loading to reach in groundwater
!! pnd_fr(:) |none |fraction of HRU/subbasin area that drains
!! |into ponds
!! pnd_no3(:) |kg N |amount of nitrate originating from surface
!! |runoff in pond at beginning of day
!! pnd_no3g(:) |kg N |amount of nitrate originating from
!! |groundwater in pond at beginning of day
!! pnd_no3s(:) |kg N |amount of nitrate originating from lateral
!! |flow in pond at beginning of day
!! pnd_orgn(:) |kg N |amount of organic N originating from
!! |surface runoff in pond at beginning of day
!! pnd_orgp(:) |kg P |amount of organic P originating from
!! |surface runoff in pond at beginning of day
!! pnd_psed(:) |kg P |amount of mineral P attached to sediment
!! |originating from surface runoff in pond at
!! |beginning of day
!! pnd_solp(:) |kg P |amount of soluble P originating from surface
!! |runoff in pond at beginning of day
!! pnd_solpg(:)|kg P |amount of soluble P originating from
!! |groundwater in pond at beginning of day
!! pnd_vol(:) |m^3 H2O |volume of water in pond
!! pndflwo |m^3 H2O |volume of water flowing out of pond on day
!! pndsedo |metric tons |sediment leaving pond during day
!! pndsep |m^3 H2O |seepage from pond on day
!! qdr(:) |mm H2O |net water loading from HRU to main channel
!! sedminpa(:) |kg P/ha |amount of active mineral phosphorus sorbed to
!! |sediment in surface runoff in HRU for day
!! sedminps(:) |kg P/ha |amount of stable mineral phosphorus sorbed to
!! |sediment in surface runoff in HRU for day
!! sedorgn(:) |kg N/ha |amount of organic nitrogen in surface runoff
!! |in HRU for the day
!! sedorgp(:) |kg P/ha |amount of organic phosphorus in surface runoff
!! |in HRU for the day
!! sedyld(:) |metric tons |daily soil loss caused by water erosion in HRU
!! shallst(:) |mm H2O |depth of water in shallow aquifer
!! surqno3(:) |kg N/ha |amount of NO3-N in surface runoff in HRU for
!! |the day
!! surqsolp(:) |kg P/ha |amount of soluble phosphorus in surface runoff
!! |in HRU for the day
!! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
!! ~ ~ ~ OUTGOING VARIABLES ~ ~ ~
!! name |units |definition
!! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
!! latno3(:) |kg N/ha |amount of NO3-N in lateral flow in HRU for the
!! |day
!! minpgw(:) |kg P/ha |soluble P loading to reach in groundwater
!! no3gw(:) |kg N/ha |nitrate loading to reach in groundwater
!! pndflwi |m^3 H2O |volume of water flowing into pond on day
!! pndsedin |metric tons |sediment entering pond during day
!! qdr(:) |mm H2O |net water loading from HRU to main channel
!! sedminpa(:) |kg P/ha |amount of active mineral phosphorus sorbed to
!! |sediment in surface runoff in HRU for day
!! sedminps(:) |kg P/ha |amount of stable mineral phosphorus sorbed to
!! |sediment in surface runoff in HRU for day
!! sedorgn(:) |kg N/ha |amount of organic nitrogen in surface runoff
!! |in HRU for the day
!! sedorgp(:) |kg P/ha |amount of organic phosphorus in surface runoff
!! |in HRU for the day
!! sedyld(:) |metric tons |daily soil loss caused by water erosion in HRU
!! shallst(:) |mm H2O |depth of water in shallow aquifer
!! surqno3(:) |kg N/ha |amount of NO3-N in surface runoff in HRU for
!! |the day
!! surqsolp(:) |kg P/ha |amount of soluble phosphorus in surface runoff
!! |in HRU for the day
!! twlpnd |mm H2O |water lost through seepage from ponds on
!! |day in HRU
!! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
!! ~ ~ ~ LOCAL DEFINITIONS ~ ~ ~
!! name |units |definition
!! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
!! cnv |none |conversion factor (mm/ha => m^3)
!! j |none |HRU number
!! pndsa |ha |surface area of pond on current day
!! xx |none |fraction of HRU not draining into ponds
!! yy |none |fraction of water leaving pond on day
!! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
!! ~ ~ ~ SUBROUTINES/FUNCTIONS CALLED ~ ~ ~
!! SWAT: pond
!! ~ ~ ~ ~ ~ ~ END SPECIFICATIONS ~ ~ ~ ~ ~ ~
use parm
integer :: j
real :: cnv, pndsa, xx, yy, qdayi, latqi
j = 0
j = ihru
if (pnd_fr(j) > 0.01) then
cnv = 0.
cnv = hru_ha(j) * 10.
!! calculate area of HRU covered by pond
pndsa = 0.
pndsa = bp1(j) * pnd_vol(j) ** bp2(j)
!! calculate water flowing into pond for day
pndflwi = qday + latq(j)
pndflwi = pndflwi * 10. * hru_ha(j) * pnd_fr(j)
qdayi = qday
latqi = latq(j)
qday = qday * (1. - pnd_fr(j))
latq(j) = latq(j) * (1. - pnd_fr(j))
pndloss = qdayi - qday
lpndloss = latqi - latq(j)
qdr(j) = qdr(j) - pndloss - lpndloss
! qdr(j) = qdr(j) - qdr(j) * pnd_fr(j)
!! calculate sediment loading to pond for day
pndsedin = sedyld(j) * (pnd_fr(j) - pndsa / hru_ha(j))
pndsanin = sanyld(j) * (pnd_fr(j) - pndsa / hru_ha(j))
pndsilin = silyld(j) * (pnd_fr(j) - pndsa / hru_ha(j))
pndclain = clayld(j) * (pnd_fr(j) - pndsa / hru_ha(j))
pndsagin = sagyld(j) * (pnd_fr(j) - pndsa / hru_ha(j))
pndlagin = lagyld(j) * (pnd_fr(j) - pndsa / hru_ha(j))
sedyld(j) = sedyld(j) - sedyld(j) * pnd_fr(j)
sanyld(j) = sanyld(j) - sanyld(j) * pnd_fr(j)
silyld(j) = silyld(j) - silyld(j) * pnd_fr(j)
clayld(j) = clayld(j) - clayld(j) * pnd_fr(j)
sagyld(j) = sagyld(j) - sagyld(j) * pnd_fr(j)
lagyld(j) = lagyld(j) - lagyld(j) * pnd_fr(j)
!! compute nitrogen and phosphorus levels in pond at beginning
!! of day: equation 29.1.1 in SWAT manual
if (pnd_solp(j) < 1.e-6) pnd_solp(j) = 0.0
if (pnd_psed(j) < 1.e-6) pnd_psed(j) = 0.0
if (pnd_orgp(j) < 1.e-6) pnd_orgp(j) = 0.0
if (pnd_solpg(j) < 1.e-6) pnd_solpg(j) = 0.0
if (pnd_orgn(j) < 1.e-6) pnd_orgn(j) = 0.0
if (pnd_no3(j) < 1.e-6) pnd_no3(j) = 0.0
if (pnd_no3s(j) < 1.e-6) pnd_no3s(j) = 0.0
if (pnd_no3g(j) < 1.e-6) pnd_no3g(j) = 0.0
xx = 0.
xx = pnd_fr(j) * hru_ha(j)
pnd_solp(j) = pnd_solp(j) + (surqsolp(j) + sedminpa(j)) * xx
pnd_psed(j) = pnd_psed(j) + sedminps(j) * xx
pnd_orgp(j) = pnd_orgp(j) + sedorgp(j) * xx
pnd_solpg(j) = pnd_solpg(j) + minpgw(j) * xx
pnd_orgn(j) = pnd_orgn(j) + sedorgn(j) * xx
pnd_no3(j) = pnd_no3(j) + surqno3(j) * xx
pnd_no3s(j) = pnd_no3s(j) + latno3(j) * xx
pnd_no3g(j) = pnd_no3g(j) + no3gw(j) * xx
!! compute amount of nutrients not passing through ponds
xx = 0.
xx = 1. - pnd_fr(j)
sedorgn(j) = sedorgn(j) * xx
surqno3(j) = surqno3(j) * xx
latno3(j) = latno3(j) * xx
no3gw(j) = no3gw(j) * xx
sedorgp(j) = sedorgp(j) * xx
sedminpa(j) = sedminpa(j) * xx
sedminps(j) = sedminps(j) * xx
surqsolp(j) = surqsolp(j) * xx
minpgw(j) = minpgw(j) * xx
call pond(j)
!! compute water leaving pond
qday= qday + pndflwo / cnv
qdr(j) = qdr(j) + pndflwo / cnv
!! compute sediment leaving pond
sedyld(j) = sedyld(j) + pndsedo
sanyld(j) = sanyld(j) + pndsano
silyld(j) = silyld(j) + pndsilo
clayld(j) = clayld(j) + pndclao
sagyld(j) = sagyld(j) + pndsago
lagyld(j) = lagyld(j) + pndlago
!! compute nutrients leaving pond
if (pndflwo > 1.e-5) then
yy = 0.
yy = pndflwo / (pnd_vol(j) + pndflwo)
sedorgn(j) = sedorgn(j) + pnd_orgn(j) * yy / hru_ha(j)
surqno3(j) = surqno3(j) + pnd_no3(j) * yy / hru_ha(j)
latno3(j) = latno3(j) + pnd_no3s(j) * yy / hru_ha(j)
no3gw(j) = no3gw(j) + pnd_no3g(j) * yy / hru_ha(j)
sedorgp(j) = sedorgp(j) + pnd_orgp(j) * yy / hru_ha(j)
sedminps(j) = sedminps(j) + pnd_psed(j) * yy / hru_ha(j)
surqsolp(j) = surqsolp(j) + pnd_solp(j) * yy / hru_ha(j)
minpgw(j) = minpgw(j) + pnd_solpg(j) * yy / hru_ha(j)
!! adjust nutrient content in pond
pnd_orgn(j) = pnd_orgn(j) * (1. - yy)
pnd_no3(j) = pnd_no3(j) * (1. - yy)
pnd_no3g(j) = pnd_no3g(j) * (1. - yy)
pnd_no3s(j) = pnd_no3s(j) * (1. - yy)
pnd_orgp(j) = pnd_orgp(j) * (1. - yy)
pnd_psed(j) = pnd_psed(j) * (1. - yy)
pnd_solp(j) = pnd_solp(j) * (1. - yy)
pnd_solpg(j) = pnd_solpg(j) * (1. - yy)
pnd_chla(j) = pnd_chla(j) * (1. - yy)
end if
!! add pond seepage to shallow aquifer convert from m^3 to mm
shallst(j) = shallst(j) + pndsep / cnv
!! compute seepage depth for HRU water balance
twlpnd = pndsep / cnv
end if
if (qdr(j) < 0.) qdr(j) = 0.
if (sedyld(j) < 0.) then
sedyld(j) = 0.0
sanyld(j) = 0.0
silyld(j) = 0.0
clayld(j) = 0.0
sagyld(j) = 0.0
lagyld(j) = 0.0
end if
return
end